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On 03/03/2016 01:13 PM, Preston L. Bannister wrote:

>     > Scanning the same volume from within the instance still gets the same
>     > ~450MB/s that I saw before.
>
>     Hmmm, with iSCSI inbetween that could be the TCP memcpy limitation.
>
>
> Measuring iSCSI in isolation is next on my list. Both on the physical host, and
> in the instance. (Now to find that link to the iSCSI test, again...)

Based on earlier comments it appears that you're using the qemu built-in iSCSI 
initiator.

Assuming that's the case, maybe it would make sense to do a test run with the 
in-kernel iSCSI code and take qemu out of the picture?

Chris